Update powered-by.md (#2595)
Update powered-by.md (#2595)

Add lizhi.fm to user list
OpenSkywalking/skywalking,ascrutae/sky-walking,apache/skywalking,ascrutae/sky-walking,apache/skywalking,apache/skywalking,OpenSkywalking/skywalking,ascrutae/sky-walking,apache/skywalking,apache/skywalking,apache/skywalking,ascrutae/sky-walking,apache/skywalking